I am looking at buy new Nimh for my sons stamped and wheel king. I am looking at the 7.2v nimh 5000mah traxxas pack vs the DuraTrax Onyx NiMH 7.2v nimh 5000mha or the DuraTrax DTX NiMH 7.2 nimh 5000mah. Has anyone run both battery packs and have a review on them.